FSD_RECSZ
c += FSD_RECSZ(fsd, fsd->fsd_size);
int64_t min_recsz = FSD_RECSZ(fsdp, sizeof (*fsdp));
recsz = FSD_RECSZ(fsdp, fsdp->fsd_size);
addr += FSD_RECSZ((&fsd), fsd.fsd_size);
cur_bytes += FSD_RECSZ((&fsd), fsd.fsd_size);
FSD_RECSZ(fsdp, fsdp->fsd_size))) {